Ultra Magnus with Over-Run vs. Treadshot with Nightbeat (Battle in a Box, 2004)

Nightbeat is a very slight redeco of the ArmadaNightbeat toy (the plastics are brighter and more matte), transforming into a motorcycle of probably-made-up model. He is specially designed to fit inside the flip-up panel in the rear of Treadshot's vehicle mode (or any version of that mold).

Another way to tell Universe Nightbeat from Armada Nightbeat is to check the rear wheel assembly (the left arm in robot mode), specifically the arm-joint that is bolted to the main body. On Armada Nightbeat, the "B"-shaped plastic part has the indent facing outward from the body. On Universe Nightbeat (and all other uses of the mold, for that matter), it's facing inward.